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Answer:
please read the answer below
Explanation:
To find the electric field you can consider the Gaussian law for a cylindrical surface inside the slab.
where Qint is the charge inside the Gaussian surface, AG is the area of the surface and rho is the charge density of the slab.
By using the formula for the volume of a cylinder you obtain:
where h is the height. If you assume that the slab is in the interval (-zo<z<z0) you can write VG:
Finally, by replacing in the expression for E you get:
hence, for z>0 you obtain E=pz/eo > 0
for z<0 -> E=pz/eo < 0
For calculating work, the force and the distance must be in the same direction
Explanation:
The work done by a force on an object is given by the equation
where
F is the magnitude of the force
d is the displacement
is the angle between the direction of the force and of the displacement
The equation can be rewritten as
where is the component of the force parallel to the displacement of the object. This means that when calculating the work, only the component of the force parallel to the motion of the object contributes to the work: in this sense, we can say then for work to be different from zero, the force must have a component in the same direction as the motion of the object.
Learn more about work:
brainly.com/question/6763771
brainly.com/question/6443626
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Uh is this true or false?
If so yeah true a concave lens is a diverging lens.